Janah, Anisa Furtakhul, et al. “Analysis of The Properties and Quick of Wave Creation on A Simple Ripple Tank Using Frequency Sensors”. Journal of Natural Sciences and Mathematics Research, vol. 5, no. 2, Dec. 2019, pp. 62-66, https://journal.walisongo.ac.id/index.php/JNSMR/article/view/11060.